GATE Mechanical Engineering (ME) 2020 Shift 2 Solved Paper

Question : 25 of 65

Marks: +1, -0

A bolt head has to be made at the end of a rod of diameter

{d}=12 {mm}

by localized forging (upsetting) operation. The length of the unsupported portion of the rod is

40 {mm}

. To avoid buckling of the rod, a closed forging operating has to be performed with a maximum die diameter of __________mm

Your Answer:

Validate

Solution:

Rod diameter (d) = 12 mm.
Unsupported Length (l) = 40 mm
The diameter of upset made is not more than 1.5 times bar diameter. If this is kept more than 1.5d, the buckling will be excessive, and stock will fold in.
Thus, maximum die diameter (D)

= 1.5 × 12

= 18

mm.

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